c161l06_09_14b

c161l06_09_14b - More on the mole More If we know the...

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More on the mole More on the mole W If we know the relative masses of the atoms, then we know the mass of 1 mole of those atoms If one product weighs a pound, and another weighs 2 lbs, then 2000 of them weigh 1 ton and 2 tons, respectively It works the same for atoms. One mole of 12 C weighs 12g, one mole of Cu weighs 63.5g W As it happens, one mole is 6.022×10 23 things
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Molar Mass Molar Mass W also called molar weight W Molar mass of an element is the mass of one mole of the element W Molar mass of a molecular compound is the mass of one mole of molecules of that compound W Molar mass of an ionic compound is the mass of one mole of formula units of that compound
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Finding number of moles Finding number of moles W n=mass of substance/molar mass of substance W Example Number of moles of F in 22.5 g of F = 22.5g/19.00g mol -1 = 1.18 Number of moles of F 2 is 22.5g of F 2 = 22.5/(2×19.00) = 0.59
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Mass Percentage and Empirical Mass Percentage and Empirical Formula Formula W Empirical formula is the simplest ratio of elements in a compound W Molecular formula is the actual numbers of atoms
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c161l06_09_14b - More on the mole More If we know the...

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